Tenma 72-3500 User manual

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MINI CLAMP METER
Model: 72-3500

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CONTENTS
IMPORTANT SAFETY INFORMATION
• When using electrical appliances basic safety precautions should always be
followed.
• Before each use, check whether the current clamp meter housing or the cable
insulation is damaged or cracked.
• When operating in dangerous environments where you may be exposed to live
wires, use personal protection equipment to prevent accidents such as electric
shock and arc discharge.
• Before removing the battery cover, remove the clamp meter from all energised
circuits and disconnect the lead wire.
• Do not use the clamp meter in circuits with a voltage higher than 600V or
frequency higher than 400Hz.
•Be careful working in environments with exposed wire as contact with the wire may
result in an electric shock.
• Be extremely careful when working with voltages above 60V DC, 30V AC or 42V
AC as they may cause electric shocks.
• Replace the batteries as soon as the low battery indicator appears.
• Only use the batteries recommended for this product - two AAA batteries.
• Ensure that the batteries are inserted correctly, observing the plus and minus
marks on both the battery and the compartment.
• Remove the batteries if they are dead, or if the product is not going to be used for
a long period of time.
•Never dispose of batteries in a re or attempt to recharge ordinary batteries.
Page Number Details
2 What’s Included
2 Important Safety Information
3 General Overview
3 Product Overview
4 LCD
4 Operation
5 NCV Non-Contact Electric Field Measurement
5 Other Functions
6Technical Specication
6 Maintenance & Repair
6 Replacing the Batteries
WHAT’S INSIDE
• Mini clamp meter
• User manual
• Two 1.5V AAA batteries

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GENERAL OVERVIEW
1. Maximum overload protection for clamp head terminal: 200A
2. Maximum display: 2000 counts, update 2-3 times per second.
Over range display: “OL”
Work temperature: 0°C to 40°C
Relative humidity: 0°C to 30°C, 75%, 30°C to 40°C, 50%
Storage temperature: -10°C to 50°C
3. Electromagnetic compatibility
In 1V/m radio frequency eld, overall frequency = designated precision + 5% of
range.
Radio frequency eld above 1V/m has no designated index.
4. Work altitude: 0 to 2000m
5. Builty-in battery: 2 x AAA 1.5V
6. Low battery: LCD displays “ ”.
7. Dimensions (approx): 158 x 60 x 33.5mm
Maximum clamp head side: 16mm
8. Weight: approx: 170g (including batteries)
PRODUCT OVERVIEW
1. Clamp head
2. Protective barrier
3. Clamp head trigger - pull the trigger to open the
clamp head.
4. Function selection button - rotate this button to
switch to corresponding functions indicated on the
panel.
5. HOLD/backlight key - for measuring readings.
Press and hold for 2 seconds to turn on or off the
backlight.
6. REL key - press to make the display show the
current reference value, then again to display
the difference between the measuring value and
reference value. Press again to exit the function.
7. MAX/MIN key - press to display the maximum
value, press again to display the minimum value.
Press it one more time and it will display (MAX-MIN).
Press and hold for a few seconds to exit the function.
8. LCD - measurement function, symbol and
numerical value.
9. Indication mark for geometric centre of the clamp
head.
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LCD
Symbol Details Symbol Details
TRMS True valid value
measurement status Ω kΩ MΩ Resistance unit
AC/DC AC/DC voltage
measurement mV, V Voltage unit
Negative reading mA, A Current unit
Diode measurement (EF) NCV Non contact AC voltage
induction
Circuit on-off measurement Auto Auto range
Data hold ZERO/REL Zero/relative measurement
MAX Maximum value hold VFC Variable frequency voltage/
current measurement
MIN Minimum value hold Low battery
MAXMIN Maximum and minimum
differentiation hold Auto power off
OPERATION
• Select range (2A~,
20A~, 200A~)
• Open the clamp head,
hook the electric wire
(single wire) and place
the electric wire on the
geometric centre.
• Make sure the left and
right clamp heads are
totally closed. There is
no gap between the left
and right clamp heads.
• Read the measurement
data from the LCD.
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NCV NON-CONTACT ELECTRIC FIELD MEASUREMENT
• If you wish to measure
whether there is AC voltage
or electromagnetic eld,
place the front end of the
clamp head 8~15mm close
to the test piece.
• Analogue quantity of
inductive AC voltage is
about ≤ critical voltage
100V, display “EF”, > critical
voltage 100V, prompted by
buzzing.
OTHER FUNCTIONS
• Automatic power-off: when measuring, if the rotary button has not been used in 15
minutes, the instrument will automatically power off to save energy.
• In automatic power-off mode, turn the rotary button to OFF and restart the
instrument or press the REL button.
• To turn off the automatic power-off function, press and hold the REL key, then turn
on the instrument and you will hear 5 buzzes, which means the automatic power-
off function is cancelled.
• Turn off and restart the machine and the automatic power-off function will be
recovered.
•The buzzer will send out ve warnings, one minute before automatic power-off.
• A long buzz will be heard before powering off. When the automatic power-off
function is cancelled, you will hear ve continuous warnings every 15 minutes.
Buzzer
• Press any key or rotate the function switch.
• If the function is valid, the buzzer will beep once.
• When measuring current out of range, the buzzer will beep to warn it is out of
range (function status as below)
• 200A gear: current > maximum range, buzzer beeps.
Detecting Low Voltage
• When the battery is lower than 2.5V, the low battery symbol appears.
• Measurements may not be as accurate once this symbol shows, therefore it is
advisable to replace the battery as soon as possible.
• If it is lower than 2.2V, only the battery under voltage symbol shows after starting
up and the instrument will not work.
• When the battery supply voltage lowers to 2.6V, the LCD backlight will be in weak
or non-start state, but measurement functions will still work.
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TECHNICAL SPECIFICATION
Accuracy: ± (a% reading + b word count), warranty period is one year.
Environment temperature: 23°C ± 5°C (73.4°F ± 9°F) relative humidity ≤ 75%.
ACA Measurement
Range Resolution Accuracy
2.000A 1mA ± (4% + 30)
20.00A 10mA ± (3% + 10)
200.0A 100mA ± (2.5% + 5)
Overload protection 200A.
• Accuracy warranty coverage: 5~100% range, 2A open circuit allows <20 residue
readings.
• The instrument’s displays are true valid values. Frequency response: 50~60Hz
• Non-sinusoidal wave counts add error by crest factor:
- when crest factor is 1~2, add 3%.
- when crest factor is 2~2.5, add 5%.
- when crest factor is 2.5~3, add 7%.
MAINTENANCE & REPAIR
• Before removing the cover of the instrument, ensure the power supply is switched
off.
• Use a damp cloth and a mild detergent to clean the instrument cover.
• Do not use any chemicals, abrasives or solvents that could damage the
instrument.
• Maintenance should be referred to qualied personnel.
REPLACING THE BATTERIES
• When the LCD shows the low battery symbol, replace the batteries immediately,
otherwise measurement accuracy may be affected.
• Move the power switch to the OFF position.
• Unscrew the screw from the battery cover, remove the battery cover and replace
the old batteries with two new replacements of the same specication (2 x AAA
1.5V).
Made in China. www.premierfarnell.com
V.1.0
INFORMATION ON WASTE DISPOSAL FOR CONSUMERS OF
ELECTRICAL & ELECTRONIC EQUIPMENT.
This symbol indicate that separate collection of Waste Electrical and Electronic
Equipment (WEEE) or waste batteries is required. Do not dispose of these items with
general household waste. Separate for the treatment, recovery and recycling of the
materials used. Waste batteries can be returned to any waste battery recycling point
which are provided by most battery retailers. Contact your local authority for details of
the battery and WEEE recycling schemes available in your area.